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These results young models links that both groups learned, but females exposed to the adult male produced fewer well-timed CRs (i. Adult virgin females can express maternal behaviors over time in response to newborn pup exposure14,20 through a process known as maternal sensitization. These same behaviors were expressed by females in puberty, as shown in Fig. The pups were born from non-experimental dams and therefore returned to their original dams for nutrition and care every 24 hours, spending 24-h with their lactating dams. For maternal behavior observations, pups were place at opposite sides of the home young models links, and maternal behaviors were observed and recorded for the first 10 minutes after placement.